[WIP] Generate a RSS feed.xml from a posts collection

feed_xml.py

import xml.dom.minidom

def feed_write(ctx, path, generator_name = 'minimapython', generator_uri = 'https://github.com/vadimkantorov/minima', generator_version = 'https://github.com/vadimkantorov/minimapython'):
    site = ctx.get('site', {})
    site__lang = site.get('lang')
    page__url__absolute_url = ''
    root__absolute_url = ''
    site__time__date_to_xml_schema = ''
    page__url__absolute_url__xml_escape = ''

    #{% assign title = site.title | default: site.name %}
    #{% if page.collection != "posts" %}{% assign title = title | append: " | " | append: (page.collection | capitalize) %}{% endif %}
    #{% if page.category %}{% assign title = title | append: " | " | append: (page.category | capitalize) %}{% endif %}
    #{% if page.tags %}
    #  {% assign posts = site.tags[page.tags] %}
    #{% else %}
    #  {% assign posts = site[page.collection] %}
    #{% endif %}
    #{% if page.category %}
    #  {% assign posts = posts | where: "categories", page.category %}
    #{% endif %}
    #{% unless site.show_drafts %}
    #  {% assign posts = posts | where_exp: "post", "post.draft != true" %}
    #{% endunless %}
    #{% assign posts = posts | sort: "date" | reverse %}
    #{% assign posts_limit = site.feed.posts_limit | default: 10 %}

    title__smartify__xml_escape = ''
    site__description__xml_escape = ''
    site__author__name__xml_escape = '' #site.author.name | default: site.author | xml_escape
    site__author__email__xml_escape = ''
    site__author__uri__xml_escape = ''
    posts = []
    posts_limit = 0

    node_doc = xml.dom.minidom.Document()
    node_root = node_doc.appendChild(node_doc.createElement('feed'))
    if site__lang:
        node_root.setAttribute('xml:lang', site__lang)
    node_root.setAttribute('xmlns', 'http://www.w3.org/2005/Atom')

    node_generator = node_root.appendChild(node_doc.createElement('generator'))
    node_generator.setAttribute('uri', generator_uri)
    node_generator.setAttribute('version', generator_version)
    node_generator.appendChild(node_generator.createTextNode(generator_name))

    node_link = node_root.appendChild(node_link.createElement('link'))
    node_link.setAttribute('href', page__url__absolute_url)
    node_link.setAttribute('rel', 'self')
    node_link.setAttribute('type', 'application/atom+xml')
    node_link = node_root.appendChild(node_link.createElement('link'))
    node_link.setAttribute('href', root__absolute_url)
    node_link.setAttribute('rel', 'alternate')
    node_link.setAttribute('type', 'text/html')
    if site__lang:
        node_link.setAttribute('hreflang', site__lang)

    node_root.appendChild(node_doc.createElement('updated')).appendChild(node_doc.createTextNode(site__time__date_to_xml_schema))

    node_root.appendChild(node_doc.createElement('id')).appendChild(node_doc.createTextNode(page__url__absolute_url__xml_escape))

    if title__smartify__xml_escape:
        node_root.appendChild(node_doc.createElement('title')).appendChild(node_doc.createTextNode(title__smartify__xml_escape))

    if site__description__xml_escape:
        node_root.appendChild(node_doc.createElement('subtitle')).appendChild(node_doc.createTextNode(site__description__xml_escape))

    if site__author__name__xml_escape:
        node_author = node_root.appendChild(node_doc.createElement('author'))
        node_author.appendChild(node_doc.createElement('name')).appendChild(node_doc.createTextNode(site__author__name__xml_escape))
        if site__author__email__xml_escape:
            node_author.appendChild(node_author.createElement('email')).appendChild(node_doc.createTextNode(site__author__email__xml_escape))
        if site__author__uri__xml_escape:
            node_author.appendChild(node_author.createElement('uri')).appendChild(node_doc.createTextNode(site__author__uri__xml_escape))

    for post in posts[:posts_limit]:
        post__lang = ''
        post__title = '' #{% assign post_title = post.title | smartify | strip_html | normalize_whitespace | xml_escape %}
        post__url__absolute_url = ''
        post__last_modified_at__date_to_xmlschema = ''
        post__date__date_to_xmlschema = ''
        post__id__absolute_url__xml_escape = ''
        post_author_name__xml_escape = ''
        post__author__email__xml_escape = ''
        post__author__uri__xml_escape = ''
        excerpt_only = False
        post__url__absolute_url__xml_escape = ''
        post__content__strip = ''
        post__category__xml_escape = ''
        post__categories__xml_escape = []
        post__tags__xml_escape = []
        post_summary__strip_html__normalize_whitespace = ''
        post_image__xml_escape = ''
        # {% assign excerpt_only = post.feed.excerpt_only | default: site.feed.excerpt_only %}
        # {% assign post_author = post.author | default: post.authors[0] | default: site.author %}
        # {% assign post_author = site.data.authors[post_author] | default: post_author %}
        # {% assign post_author_email = post_author.email | default: nil %}
        # {% assign post_author_uri = post_author.uri | default: nil %}
        # {% assign post_author_name = post_author.name | default: post_author %}
        # {% assign post_summary = post.description | default: post.excerpt %}
        # {% assign post_image = post.image.path | default: post.image %}
        # {% unless post_image contains "://" %}{% assign post_image = post_image | absolute_url %}{% endunless %}


        node_entry = node_root.appendChild(node_doc.createElement('entry'))
        if post__lang:
            node_entry.setAttribute('xml:lang', post__lang)

        node_title = node_entry.appendChild(node_doc.createElement('title'))
        node_title.setAttribute('type', 'html')
        node_title.appendChild(node_doc.createTextNode(post_title))

        node_link = node_entry.appendChild(node_link.createElement('link'))
        node_link.setAttribute('href', post__url__absolute_url)
        node_link.setAttribute('title', post__title)
        node_link.setAttribute('rel', 'alternate')
        node_link.setAttribute('type', 'text/html')

        node_entry.appendChild(node_doc.createElement('published')).appendChild(node_doc.createTextNode(post__date__date_to_xmlschema))
        node_entry.appendChild(node_doc.createElement('updated')).appendChild(node_doc.createTextNode(post__last_modified_at__date_to_xmlschema))
        node_entry.appendChild(node_doc.createElement('id')).appendChild(node_doc.createTextNode(post__id__absolute_url__xml_escape))

        node_author = node_entry.appendChild(node_doc.createElement('author'))
        node_author.appendChild(node_doc.createElement('name')).appendChild(node_doc.createTextNode(post_author_name__xml_escape))
        if post__author__email__xml_escape:
            node_author.appendChild(node_author.createElement('email')).appendChild(node_doc.createTextNode(post__author__email__xml_escape))
        if post__author__uri__xml_escape:
            node_author.appendChild(node_author.createElement('uri')).appendChild(node_doc.createTextNode(post__author__uri__xml_escape))

        if not excerpt_only:
            node_content = node_entry.appendChild(node_doc.createElement('content'))
            node_content.setAttribute('type', 'html')
            node_content.setAttribute('xml:base', post__url__absolute_url__xml_escape)
            node_content.appendChild(node_doc.createCDATASection(post__content__strip))

        if post__category__xml_escape:
            node_entry.appendChild(node_doc.createElement('category')).setAttribute('term', post__category__xml_escape)

        for post__category__xml_escape in post__categories__xml_escape:
            node_entry.appendChild(node_doc.createElement('category')).setAttribute('term', post__category__xml_escape)

        for tag__xml_escape in post__tags__xml_escape:
            node_entry.appendChild(node_doc.createElement('category')).setAttribute('term', tag__xml_escape)

        if post_summary__strip_html__normalize_whitespace:
            node_content = node_entry.appendChild(node_doc.createElement('summary'))
            node_content.setAttribute('type', 'html')
            node_content.appendChild(node_doc.createCDATASection(post_summary__strip_html__normalize_whitespace))

        if post_image__xml_escape:
            node_mediathumbnail = node_entry.appendChild(node_doc.createElement('media:thumbnail'))
            node_mediathumbnail.setAttribute('xmlns:media', 'http://search.yahoo.com/mrss/')
            node_mediathumbnail.setAttribute('url', post_image__xml_escape)
            node_mediacontent = node_entry.appendChild(node_doc.createElement('media:content'))
            node_mediacontent.setAttribute('xmlns:media', 'http://search.yahoo.com/mrss/')
            node_mediacontent.setAttribute('url', post_image__xml_escape)
            node_mediacontent.setAttribute('medium', 'image')

    with open(path, 'w') as fp:
        node_doc.writexml(fp, addindent = '  ', newl = '\n')